<template>
  <div class="article-container">
    <!-- 导航栏 -->

    <van-nav-bar class="page-nav-bar" left-arrow @click-left="onClickLeft" title="黑马头条"></van-nav-bar>

    <div class="main-wrap">
      <!-- 加载中 -->
      <div class="loading-wrap" v-if="loading">
        <van-loading color="#3296fa" vertical>加载中</van-loading>
      </div>

      <!-- 加载完成-文章详情 -->
      <div class="article-detail" v-else-if="article.title">
        <!-- 文章标题 -->
        <h1 class="article-title">{{ article.title }}</h1>

        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image class="avatar" slot="icon" round fit="cover" :src="article.aut_photo" />
          <div slot="title" class="user-name">{{ article.aut_name }}</div>
          <div slot="label" class="publish-date">{{ article.pubdate | relativeTime }}</div>
          <FollowUser class="follow-btn" v-model="article.is_followed" :userId="article.aut_id"
            @update-is_followed="article.is_followed = $event" />
          <!-- <van-button :loading="loading" @click="onFollow" v-if="isFollow ed" class="follow-btn" round size="small">已关注
          </van-button>
          <van-button v-else @click="onFollow" class="follow-btn" type="info" color="#3296fa" round size="small"
            icon="plus" :loading="loading">关注</van-button> -->

        </van-cell>

        <!-- 文章内容 -->
        <div ref="article-content" class="article-content  markdown-body" v-html="article.content"></div>
        <van-divider>正文结束</van-divider>
        <!-- 文章评论 -->
        <CommentList :source="article.art_id" @onload-success="totalCommentCount = $event.total_count"
          :list="commentList" @reply-click="onReplyClick" />
        <!-- 文章评论 -->
      </div>

      <!-- 加载失败：404 -->
      <div class="error-wrap" v-else-if="errStatus === 404">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div v-else class="error-wrap">
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button class="retry-btn">点击重试</van-button>
      </div>
    </div>

    <!-- 底部区域 -->
    <div class="article-bottom" v-if="article.title">
      <van-button class="comment-btn" type="default" round size="small" @click="isPostShow = true">写评论</van-button>
      <van-icon name="comment-o" :info="totalCommentCount" color="#777" />
      <!-- <van-icon color="#777" name="star-o" /> -->
      <CollectArticle v-model="article.is_collected" :articleId="article.art_id" />
      <!-- <van-icon color="#777" name="good-job-o" /> -->
      <LikeArticle v-model="article.attitude" :articleId="article.art_id" />
      <van-icon name="share" color="#777777"></van-icon>
    </div>
    <!-- 发布评论 -->
    <van-popup v-model="isPostShow" closeable position="bottom" :style="{ height: '20%' }">
      <CommentPost v-model="isPostShow" position="bottom" :target="article.art_id" @post-success="onPostSuccess" />
    </van-popup>

    <!-- 发布评论 -->

    <!-- 评论回复 -->
    <van-popup v-model="isReplyShow" position="bottom" style="height: 90%">
      <!-- v-if 条件渲染
        true 渲染元素节点
        false 不渲染
      -->
      <CommentReply v-if="isReplyShow" :comment="currentComment" @close="isReplyShow = false" />
    </van-popup>
    <!-- 评论回复 -->
  </div>
</template>

<script>

import { getArticleById } from '@/api/article'
import { ImagePreview } from 'vant'

import FollowUser from '@/components/follow-user/index.vue'
import CollectArticle from '@/components/collect-article/index.vue'
import LikeArticle from '@/components/like-article/index.vue'
import CommentList from "./components/comment-list.vue"
import CommentPost from './components/comment-post.vue'
import CommentReply from './components/comment-reply.vue'
export default {
  plugins: {
    'postcss-pxtorem': {
      rootValue({ file }) {
        return file.indexOf('vant') !== -1 ? 37.5 : 75
      },

      // rootValue: 75,

      // 配置要转换的 CSS 属性
      // * 表示所有
      propList: ['*'],

      exclude: 'github-markdown'
    }
  },
  name: 'ArticleIndex',
  components: {
    FollowUser, CollectArticle, LikeArticle, CommentList, CommentPost, CommentReply
  },
  data() {
    return {
      article: {},
      loading: true,
      // followLoading:false,
      errStatus: 0,
      isPostShow: false,
      totalCommentCount: 0,
      commentList: [],  //评论列表
      isReplyShow: false,
      currentComment: {}  //当前点击回复的评论项
    }
  },
  // 注入依赖 provide   用inject接
  provide: function () {
    return {
      articleId: this.articleId
    }
  },
  props: {
    articleId: {
      type: [Number, String, Object],
      required: true
    },

  },
  activated() {
    this.loadArticle()
  },
  deactivated() {
    // console.log('组件失活了');
  },
  created() {
    this.loadArticle()

  },
  methods: {
    async loadArticle() {
      this.loading = true
      try {
        const { data } = await getArticleById(this.articleId)
        console.log(data);
        this.article = data.data
        setTimeout(() => {
          this.previewImage()
        }, 200)
      } catch (err) {
        if (err.response && err.response.status === 404) {
          this.errStatus = 404
        }
      }
      this.loading = false
    },
    previewImage() {
      const articleContent = this.$refs['article-content']
      const imgs = articleContent.querySelectorAll('img')
      const images = []

      imgs.forEach((item, index) => {
        images.push(item.src)

        item.onclick = () => {
          ImagePreview({
            images: images,
            startPosition: index
          })
        }

      })

    },

    onPostSuccess(data) {
      this.isPostShow = false
      this.totalCommentCount++
      this.commentList.unshift(data.new_obj)
    },
    onClickLeft() {
      this.$router.back()
    },
    onReplyClick(comment) {
      console.log(comment);
      this.currentComment = comment
      // 显示评论回复弹出层
      this.isReplyShow = true
    }
  }
}
</script>

<style scoped lang="less">
@import './github-markdown.css';

.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }

  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;

      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }

      .van-cell__label {
        margin-top: 0;
      }

      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }

      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }

      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;

      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;

    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }

    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }

    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {

    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;

    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }

    .van-icon {
      font-size: 40px;

      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>